Paul Scott schreef:
On Wed, 2008-02-27 at 19:50 +0800, skylark wrote:
What design patterns do you usually use?
I am not sure that you are understanding what a design pattern is. It is
not a piece of software or a thing to use, but it is a set of repeatable
components that you use in whatever app you are writing.
Take for instance an observer pattern. When would you use that? Why
would you use that? Have you used it somewhere before and what were the
circumstances? Is it repeatable? Is your previous code re-usable?
Answer some of those questions, look up design patterns (even on
wikipedia to get an overview) and buy some books to see solid examples.
If you suspect that you "need" to use a specific pattern, or are
interested in how to implement a specific pattern, write some throwaway
code to do it and ask opinions.
Look at the simple things that you would probably have used already -
factory, singleton and MVC and expand on those a little to get them to
be actual design "patterns" that you can use/reuse.
there seems to be some misunderstanding ... a design pattern is not
a component (or anything else of substance) but merely a conceptual
strategy used to tackle a problem ... ever find yourself writing code
that's conceptually identical to previously written code (in a different
site/project/context), if so you've got yourself a pattern and as such it's
probably been documented as an 'official' design pattern with suitable fancy
name (something like 'Observer', 'Delegator', 'Factory')
chances are then that you're already using design patterns - it's just
that you don't know them by name :-)
Don't "use design patterns" because you heard it on TV - same as
"Web2.0" _think_ about what it means to you and your enterprise before
asking for a buzzword generator to do your job for you! :)
--Paul
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